The problem with PayPal is that starting November 18th they are instituting buyer protection for up to 180 days.
Essentially it is a 6 month money back guarantee. This was instituted by PayPal to avoid loosing money on credit card charge backs.
I am sure there are folks selling gear who have no idea this is going on.

From PayPal:

"We’re increasing the time for buyers to file a merchandise dispute (Item Not Received and Significantly Not as Described) from 45 days to 180 days. All references in the User Agreement to “Opening a Dispute within 45 days” have been updated to reflect “Opening a Dispute within 180 days.”"

-- In other words: any buyer using PayPal to purchase items from online vendors will enjoy a six-month return window, which in turn means no seller can assume a transaction is truly complete (and payment received truly theirs) for that long.

Frankly, any seller of used equipment that uses PayPal after November 18th has got to be crazy. You are now in the extended warranty business.